1. ## circle

Hey, i got my final GCSE maths test (non calc) which starts in around 1 and a half hours!
I don't get this question:

EDIT: HERE IS THE GRAPH. SORRY IN A RUSH AND FORGOT LOL.

A, B, C and D are points on the circumference of a circle, centre P.
AC is the diameter of the circle.

Angle DAC = 20°

(a) Find the size of angle ACD

(b) Find the size of angle DBC

I need some help real quick!

Need to leave in 40 mins!

3. Angle ADC=90° because a circumferential angle leaning on the diameter is a right angle (sorry for my english, I don't know if I have used the correct expressions)

so Angle ACD = 180 - 20 - 90 = 70

4. sorry, I guess it's called "inscribed angle" not "circumferential angle"...

5. so, every inscribed angle that subtends a diameter is a right angle..

6. Thanks!

What about part (b) to the question?

SORRY THERE IS MEANT TO BE A LINE FROM B - C

I was in such a rush i missed it out..

Thanks!!

7. please someone do part B!

I need to leave in 10 mins!

8. I think angle DBC is also 20° because both subtend the same arc.

9. GOOD LUCK m8

10. oh yeah!

Ok thanks!!

THANK YOU VERY MUCH WISH ME LUCK